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Finding the Fourth Proportional to 21,417.80, 32,126.70 and 20,980.40

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Solution

The fourth proportional to 21,417.80, 32,126.70 and 20,980.40 is: 31,470.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,417.80 : 32,126.70 = 20,980.40 : x
  2. Step 2: Convert to fraction form
    21,417.80/32,126.70 = 20,980.40/x
  3. Step 3: Cross multiply
    21,417.80x = 32,126.70 × 20,980.40
  4. Step 4: Simplify right side
    21,417.80x = 674,031,016.68
  5. Step 5: Solve for x
    x = 674,031,016.68/21,417.80
  6. Step 6: Final answer
    x = 31,470.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.